US2912051A - Timer - Google Patents

Description

Nov. 10, 1959 J, RT 2,912,051

TIMER Filed Nov. 5, 1954 4 Sheets-Sheet 1 001mm 1/. ALBERT INVENTOR. I

Nov. 10, 1959 D. J. ALBERT 2,912,051

TIMER Filed Nov. 5, 1954 4 Sheets-Sheet 2 DONALD J ALBERT IN V EN TOR.

. d f ATTORNEVS Nov. 10, 1959 File d Nov.

D. J. ALBERT TIMER 4 Sheets-Sheet 3 DONALD J ALBERT ZVVZZLVTOR. BY

f A T TOR/VEYS Novrlo, 1959 D. J. ALBERT 2,912,051

TIMER Filed Nov. 3, 1954 4 Sheets-Sheet 4 Fig. /2

Fig. /3

DONALD .1. ALBERT INVENTOR.

ATTORNEYS United States Patent "cc TIMER Donald J. Albert, Rochester, N.Y., assignor to Eastman Kodak Company, Rochester, N.Y., a corporation of New Jersey Application November 3, 1954, Serial No. 466,537 18 Claims. (c1. 161-1) The present invention relates to timers, and more particularly to a timer for timing separate operations of predetermined time intervals and in a definite timed sequence.

The timer of the present invention is designed primarily, although not exclusively, for a reflex printer to time an exposing operation or cycle; and, if desired, then to time a developing operation or cycle. To secure this result, a pair of cams are driven at a constant speed by an electric motor. A switch is connected into the motor circuit and a second switch is also connected in parallel relation into a lamp bank circuit. A second motor switch is connected in parallel relation to the other two switches, all of which will be later more fully described. Means are provided first to close the lamp blank circuit to turn on the lights, and to close the first motor switch to energize the motor. A blocking portion of one of the cams is positioned to prevent the closing of the second motor switch. The lamps are turned'on to make the exposure; and, after a predetermined time interval, the other cam has been rotated to a position to open the switch in the lamp circuit to extinguish the lamps and simultaneously open the motor circuit to stop the motor, thus completing the exposing cycle. The timer then automatically returns the cams to their initial setting so that another exposing cycle may be provided. This procedure may be repeated indefinitely to provide a plurality of exposing cycles.

However, if, after an exposing cycle has been completed, it is desired to time a developing cycle, a member is positioned to prevent the return of the cams to their initial setting position which they would normally assume at the end of an exposing cycle. Instead the cams are held or retained at what may be called the zero position. In this position, the cam which turns off the lamp switch and the first motor switch is now positioned to block these switches against a second closing. On the other hand, the second cam is positioned in non-blocking relation with the second motor switch so the latter may now be closed to energize the motor to drive the two cams. At the end of the developing cycle, the second cam reaches a point where it opens the second motor switch to stop the motor. After this developing cycle, both cams are returned automatically to the initial setting or position to permit the start of another exposure cycle.

Thus, either a series of separate exposure cycles of definite duration may be provided, or successive exposure and developing cycles may be timed. In any case, the blocking members are so positioned at the beginning of any cycle that only the switch or switches which control one cycle may be closed, and the switches controlling the other cycle are blocked against closing. Thus, a positive interlock is provided so that only one cycle may be performed at one time. However, after the completion of a definite timed interval the cycle or operation is completed and the parts return to the position to start the next cycle.

2,912,051 Patented Nov. 10, 1959 The invention has as its principal object the provision of a new and improved timer.

Another object of the invention is, the provision of a timer which will control a plurality of cycles or operations of predetermined time intervals and in a definite sequence.

Still another object of the invention. is the provision in a timer of means for limiting the timer to the control of a single operation or cycle at a time.

Yet another object of the invention is the provision of a timer which is simple in structure, comprises few parts of rugged construction, accurate, easy to operate and positive in its action.

To these and other ends the invention resides in certain improvements and combinations of parts, all as will be hereinafter more fully described, the novel features being pointed out in the claims at the end of the specification.

In the drawings:

Fig. l is a front elevation view of a reflex printer and developing device, showing the relation thereto of the timer of the present invention;

Fig. 2 is a side elevation view of a timer constructed in accordance with the present invention, with a side plate removed, showing more clearly the relation of the parts;

Fig. 3 is a vertical sectional view taken substantially on line 33 of Fig. 2, showing the switch closing mechanisms;

Fig. 4 is a right end view of the timer illustrated in Fig. 2, with part of the housing and the control knob in section;

Fig. 5 is a vertical sectional view taken substantially on line 5-5 of Fig. 4, showing the relation of the timer setting mechanism;

Fig. 6 is a partial view of the mechanism illustrated in Fig. 2, but on a larger scale than the latter, showing the relation of the switch control toggle members and the control cams;

Fig. 7 is a partial view of the gear on the cam or timer shaft, showing one of the members for retaining the cams in Zero position;

Fig. 8 is a right side view of the gear and retaining member shown in Fig. 7;

Fig. 9 is a perspective view of the two cams adjusted for a setting of a l5-second exposure cycle;

Fig. 10 is a view similar to Fig. 9 but with the cams at the zero setting;

Fig. 11 is a wiring diagram of the lamp bank and motor and the control switches therefor, and

Fig. 12 is a side elevation view of one of the cams showing the relation of the electric circuit and switches and the operating mechanism therefor; this figure is taken substantially on line 12-12 of Fig. 4;

Fig. 13 is similar to Fig. 12, showing the other cam and control means therefor and the electric switch controlled thereby; this figure is taken substantially on line 1313 of Fig. 4;

Similar reference numerals throughout the various views indicate the same parts.

The mechanism to be described is a dual purpose timer. The first part of the timer cycle closes a pair of electrical contacts or switches which energize an electric motor and a lamp bank for a predetermined time to give a sensitized paper proper exposure. This operation may be called the exposure or printing cycle. A second part of the cycle is a fixed time for processing or developing the exposed paper, and is designated as the developing cycle. The timer, in the present embodiment, is shown by way of illustration as used in connection with a reflex printer. It is apparent, however, that the timer may be used for a wide variety of other purposes, and the posing cycle.

showing in connection with the reflex printer is not intended and should not be construed as a limitation.

The prlnter, per se, forms no part of the present invention and may be of any suitable or standard design.

One form may, for example, comprise a boxlike member 20 having an upper enclosed portion 21 in which the lamp bank, broadly designated by the numeral 22, Fig. 11, is housed. The top of the portion 21 is provided with an opening, not shown, which is covered by a glass plate, also not shown, on which the materials to be printed are placed. A movable platen 23 is positioned above the portion 21 and cooperates with the glass plate to hold the printing materials in position during the printing or ex- An intermediate portion 24 of member 243 is provided to store a supply of matrix paper, not shown. The lower portion 2501f the device is in the form of an open tray in which the developing solution is positioned. After the matrix has been exposed, it is placed in the developing solution for a definite time period which is indicated by the timer of the present invention, as will be later more fully described. After the exposed matrix has been left in the solution for a definite period of time, a paper sheet is pressed against the developed matrix to secure a positive copyof the original. As the reflex printer, and the developing above described do not constitute a part of the present invention, it is not further illustrated or described.

The timer of the present invention is mounted in a suitable housing having opposite sidewalls 30, in which is rotatably mounted a cam shaft 31 which projects out through a front wall 32 of the portionZl and carries a setting knob 33. This knob is formed with a pointer or mark 34 which cooperates with a fixed scale 35, on the portion 21 or a plate attached thereto, to indicate the length of the exposure or printing cycle. The cam shaft also has secured thereto an exposure timing cam 36 and a developing timing cam 37, as best shown in Figs. 4, 9 and 10. The right end of shaft 31, as viewed in Fig. 4, carries a gear 38 which meshes with a pinion mounted on the shaft of an electric motor 41. Thus, when the motor is energized, as will be later more fully described, the pinion and gear will rotate the shaft 31 and cams 36 and 3'7 at a constant speed to time the exposing and developing cycles in a manner to be later more fully described. The motor 41 has built therein a clutch mechanism, not shown, which serves to declutch the motor shaft when the motor is deenergized, so that when the motor is not in operation, the cam shaft 31 is disconnected from the motor. As this motor and clutch arrangement is standard product, and form no part of the present invention, it is not shown or described. Suffice it to say, that any time the motor 41 is deenergized, the cam shaft 31 is disconnected from the motor 41. The left end of shaft 31, as viewed in Fig. 4, carries a coil return spring 42, one end of which is anchored to the shaft 31 while the other end may be attached to any suitable support, such as housing 39. This spring 42 always tends to rotate the shaft 31 in a clockwise direction, as viewed in Fig. 5. Adjacent the return spring 42 the shaft 31 is provided with a radially. extending arm 43 which is held in engagement with a stud 44 on the knob 33 by the return spring 42.

in setting the timer for a definite exposure or printing time, say 15 seconds, the knob 33 is rotated to bring a pointer 34 thereon into registry with the l-second mark on the scale 35, as shown in Fig. 5. Such movement of the knob 33 will carry with it stud 44 to position the latter at the dotted location 44', see Fig. 5. When the stud 44 has been thus moved by the knob 33, the coil spring 42 will rock the shaft 31 automatically clockwise to hold the arm 43 in positive contact with the stud at 44. The mechanism is now adjusted for a IS-second exposure or printing time. Also, the earns 36 and 37 are now in the position illustrated in Fig. 9.

The lamp bank 22, see Fig. 11, has the right side 50 cantilever spring 64 to press upward on both of the portions 74 of the two toggle members 66 and tend to rock thereof connected to an electric supply line 51, while the left side 52 of the lamp bank is connected through a switch 53 to a left supply line 54. The motor 41 is connected in parallel relation with the lamp bank 22, see Fig. 11, and has a switch 55 connected in series with the motor 41. As shown in Fig. 11, the two switches 53 and 55 are connected by an arm 56 so that both switches may be opened and closed together. This is merely illustrative of one way of connecting the lamp bank and motor switches so that both circuits will be operated simultaneously during the exposing or printing cycle. Other constructions will readily suggest themselves to an electrical engineer or electrician to connect the switches of the lamp bank and motor so they may operate in unison. A second independent switch 57 is connected in series with the motor circuit and parallel with the first motor switch for a purpose to be later more fully described.

To start the motor 41, a starting arm 60 is moved downward, as indicated by the arrow in Fig. 5. This arm is secured to a shaft 61 which is rocked clockwise,

, Figs. 2 and 5, by the downward movement of the arm 66. The shaft 61 has mounted thereon a radially extending bar 62to the under side'of which is secured, by bolts or rivets 63, a pair of cantilever members or springs 64, the free ends of which separately engage the toggle members, broadly indicated by the numeral 66. Both toggle members 66 are mounted for separate and independent rocking movement about aligned pivots 67 carried by the side walls 30 and the spaced brackets 68, asshown in Figs. 2 and 6. As both toggle members 66 are identical in structure, only one will be described in detail. Any corresponding parts in the, other toggle member will be designated by the same numerals.

Each toggle member comprises a pair of plates 69 and 70, mounted for rocking movement about and spaced axially of pivots 67, best shown in Figs. 6, 12 and 13. These plates are connected by upper and lower shafts or pins 71 and 72, respectively. The center of each lower pin '72 is cut away as shown at 7 3 to receive the free end of a coil spring 32. In addition, each upper pin 71 is provided with alaterally extending portion 74 which projects beyond the plate 70 and cooperates with the adjacent cam 36 or 37, as shown in Figs. 4, 9 and 10, and later to be more fully described. On the other hand, the free ends of the cantilever springs 64 engage portions 74' of the lower pins 72 for a purpose to be later described.

From the above description it will be apparent that when arm 60 is rocked downward, the shaft 61 and bar 62 will be rocked clockwise, as viewed in Fig. 2. This clockwise movement will cause the ends of both of the both toggle members counterclockwise about shaft 67, as viewed in Figs. 2 and 6. However, it will be remembered that the setting knob 33 has been positioned, see Fig. 5, to indicate a l5-second exposure or printing time, and this setting of knob 33 has positioned the two cams 36 and 37 in the positions shown in Fig. 9. From an inspection of this figure, it is apparent that portion 74 of the upper pin 71 of the left toggle 66 is in registry with the cutaway part '75 of the left cam 36, while the corresponding portion 74 of the right toggle is in engagement with the raised portion 76 of the right cam 37. For the purpose of clarity, in Figs. 9 and 10 only, the extending portion '74 of the upper pins 71 are shown. However, the remaining parts of the toggle members are all shown in Fig. 4. Y

With the earns 36 and 37 in the position shown in Fig. 9, it is apparent that any attempt to rock the right toggle member by means of the right spring 64 will bring the portion 74 of the right toggle into engagement with the raised portion 76 of the cam 37, and will thus prevent the rocking or the right toggle, However, as the pin portion 74 of the left toggle registerswith the cutaway portion 75 of the cam 36, the left cantilever spring 64 is effective to rock the left toggle 66 counterclockwise to the position shown in dotted lines in Figs. 2 and 6. Thus, the clockwise rocking of shaft 61 has been transmitted to the left cantilever spring 64 to rock the left toggle 66 at the dotted position shown in Figs. 2 and 6.

Each plate 69 and 70 of each toggle member 66 has a notch 77 adapted to receive an end 78 of an arm 79 of a flat U-shaped spring, broadly designated by the numeral 80, see Figs. 3 and 6. The cross member 81 of each spring 80, see Fig. 3, has connected thereto one end of a coil spring 82, the other end of which is anchored to the lower pin 72 of the associated toggle member, as clearly illustrated in Figs/3,12 and 13. The cross piece 81 of each spring 80 carries an insulating lug 83. Now, when the left toggle member 66 is rocked counterclockwise by the cantilever spring 64, as above described, the ends 78 of the arm 79 of the left spring 80 are carried downward to the position shown in Fig. 13 and the solid line position in Fig. 6. The crosspiece 81 of each spring 80 has a lateral extension 80a, Fig. 3, which extends through an aligned opening 80b in one of the side walls 30. Then when the control portion 75 of cam 36 or 113 of cam 37 is in registry with one of the pin extensions 74, the toggle 66 carrying said pin is allowed to move upwardly about its pivot 67 due to the action of cantilever spring 64. This moves the right end of coil spring 82 upwardly and the ends 78 of arms 79 of spring 80 downwardly whereby when the line of force of the spring 82 passes above the ends 78, the coil spring 82 pivots the spring 80 upwardly about notches 77 in the toggle. This movement of the spring 80 serves to close the associated switches 53 and 55 or 57, and the extension 80a engages the upper edges 800 of spring 8012 to limit the upward movement of coil spring 82. However, when the spring 80, associated with cam 37, Fig. 13, is moved upward a'single switch 57 is closed, as shown in Figs. 11 and 13. When either of the toggles 66 is moved down by its respective cam 36 or 37, the right end of the coil spring 82 is moved downwardly and pivots spring 80 downwardly to the position shown in Fig. 12 above and extension 80a engages the lower edge 80a to limit the downward movement of spring 80. In the position of spring 80 button 83 moves downwardly to allow switches 53 and 55 or 57 to open.

While the exposure is being made, the motor 41, through the pinion and gear 38, gradually rotates a shaft 31 and the earns 36 and 37 counterclockwise, as indicated by the arrow in Fig. 2. This rotation is at a constant speed and continues until a shoulder 87 between the cut-out portion 75 and the raised portion 88 of cam 36 is reached. At that time the raised portion 88 of cam 36 finally engages the portion 74 of the upper pin 71 of the left toggle 66 to rock the latter clockwise about pivot 67. Such a clockwise rocking of the left toggle causes the spring 80 to move downwardly gradually to the solid line position shown in Figs. 2 and 6. Such movement tensions spring 82 and when the parts pass dead center, the spring 80 quickly snaps open both switches 53 and 55. Thus the extension 80a engages the lower edge 80a of the opening 80b to limit the downward movementof the crosspiece 80a. As the cam 36 has been positioned by the. knob 33 for a definite time interval, the lamp bank and the motor are cut out automatically at the end of this time interval to provide an exposure period of a predetermined time, such as 15 seconds. During the counter clockwise rotation of shaft 31, the arm 43 is carried counterclockwise from stud position 44' to a position near that shown in Fig. 5. However, when the motor switch 55 is open, the motor is deenergized, and, as mentioned above, the shaft 31 is disconnected from the motor. Now the return spring 42, which has been tensioned during'the reverse rotation of the cam shaft 31 now becomes effecti e to rock the shaft 31, and its cams 36 and 37, clockwise to position arm 43 again in contact with the stud at 44' and position the earns 36 and 37 as shown in Fig. 9 for the start of another exposure cycle. Thus, at the end of the exposure cycle, the parts are immediately and automatically returned to their initial setting so that a new cycle may be initiated by pressing down the arm 60. Thus, a series of successive exposures may be performed and at the end of each cycle the earns 36 and 37 are automatically returned to the position shown in Fig. 9, and the arm 43 is rocked clockwise into engagement with the stud at 44. Now, as starter arm 60 is again pressed down, the bar 62 and the left cantilever spring 64 will again rock the left toggle member again to close the lamp and motor switches 53 and 55, respectively, to perform another exposure cycle.

It will be remembered that due to the position of the raised portion 76 of the right cam 37, the right toggle cannot be rotated counterclockwise during this exposure cycle. Thus, each time the arm 60 is pressed downward an exposure cycle of a predetermined time is provided. At the end of the cycle the parts are returned to a position to start another exposure cycle.

While successive exposure cycles may be performed, as explained above, it is usually preferred to follow the exposing cycle with a developing cycle, so as to develop the exposed matrix before performing the next exposure. Thus, a developing cycle will usually follow each exposing cycle. The device of the present invention is admirably adapted for this dual cycle operation. However, it will be remembered from the above description that at the end of each exposure cycle, the earns 36 and 37 are returned to the position shown in :Fig. 9 which is the position to start another exposing cycle. In this position the right toggle member cannot be operated. Therefore, in order to provide a developing cycle following an exposing cycle, the cams are stopped at the position shown in Fig. 10 which is designated the zero position. To thus stop cams 36 and 37 in this position, means is provided limiting the return clockwise movement of the shaft 31 and cams 36 and 37 by spring 42 after the exposure cycle.

To secure this result, the gear 38 is formed with a substantially triangular shaped opening 95, Fig. 7, having a base 96 and inclined sides 97. An arm 98 of an L-shaped member extends through opening and normally rests on the base 96. The other arm 99 of the L-shaped member is wedged between a wall 30 of housing 20 and a fixed Washer 101, see Fig. 8. Now, when the shaft 31 is rotated counterclockwise by the motor 41, Fig. 2, during the exposure cycle, the gear carries the L-shaped member with it and pinches arm 99 between wall 30 and washer 101 and tends to hold arm 99 against movement with gear 38 to impart a counterclockwise rocking of arm 98 about edge 102, to the position illustrated in Fig. 7.

A shaft 103 carried by the housing 20 is provided with an operating arm or knob 104 which overlies the front plate of the housing as shown in Fig. 5. Knob 104 has a dot or other indicating member 105 which cooperates with a pair of marks designated as A and B, Fig. 5. The shaft 103 carried a radially extending arm 106 which engages in bifurcations 107 formed in the right end, see Fig. 2, of a bracket 108 pivoted at 109 on wall 30 of housing 20. The under side of bracketj108 has secured thereto, a leftward extending arm 110, the left end, see Fig. 2, of which is formed with a bent down portion 111 which forms a stop for the right edge 112 of the arm 98.

If only a succession of exposing cycles are performed, the knob 104 is rotated counterclockwise to bring the dot 105 into registry with the mark A. This movement of shaft 103 will rock bracket 108 clockwise about pivot 109 to lift the stop 111 out of the path of the right edge 112 of the arm 98. Now, after the exposure cycle has been completed, the parts are returned to the position knob 104 is rocked clockwise to position dot 105 in registry with mark B. This clockwise rotation of the knob 104, and hence shaft 103, will impart a counterclockwise rocking of bracket 108 about pivot 109 to move stop 111 downward and into the path of edge 112 of arm 98. Now, when the exposure cycle has been completed and cam 36 has opened switches 53 and 55, the triangular opening .95 is just slightly to the left of the position shown in Fig. 2. As the motor has been deenergized, it is disconnected from shaft 31 which tends I to rock clockwise under the action of the return spring 42. Such rocking movement will, however, cause arm 99 to be pinched between wall 100 and washer 1M. Such pinching will serve to impart a counterclockwise rotation to the arm 98 to rock the latter counterclockwise about its edge 102 to move the arm 98 from the resting position on base 96 to the raised position illustrated in Fig. 7. In the raised position, the end 112 is positioned in the path of stop 111. As the gear 38 is rotated further clockwise, the end 112 will finally engage stop 111 to hold the gear 38 and to prevent the parts from returning to the initial position, as shown in Fig. 9, and to hold the parts in Zero position as shown in Figs. 2 and 10. In this zero position the arm 43 is vertical and at the zero part of the scale 35, and is not against stud 44', as is the case after an exposing cycle. This L- shaped member with its arms 98 and 99 is quite similar to the member shown in Fig. 6 of the patent to Wittel et al., 2,688,389, issued September 7, 1954, and operates in substantially the same manner as this Wittel et a1. structure to position the blocking arm 98 in blocking relation with stop 111.

Referring now to Fig. 10, the position of the earns 36 and 37 is shown when the parts are in the zero position. It will be apparent from an inspection of this figure that the portion 74 of the upper pin 71 of the left toggle member is now in registry with the raised portion 88 of the cam 36, while the portion 74 of the upper pin of the right toggle is now in registry with the cutaway portion 113 of cam 37. Therefore, when the starting arm 60 is depressed, the ends of the two cantilever springs ,64 tend torock both toggle members counterclockwise about shaft 67.

However, due to the position of cam 36 the raised portion 88 thereof will be positioned in the path of the portion 74 of pin 71 to prevent such rocking of the left toggle. On the other hand, as cutaway portion 113 of cam 37 is in registry with the portion 74 of the upper pin of the right toggle, the latter may be rocked counterclockwise about its pivot 67. Such rocking of the right toggle member will serve to tension the spring 32 associated with the U-shaped spring 80 connected to the right toggle to snap the switch 57 into closed position. The closing of the switch 57 starts a developing cycle which, in the present instance, is 20 seconds.

With the switch 57 closed, the motor will drive shaft 31 and cams 36 and 37 counterclockwise from the position illustrated in Fig. 2. When the 20-second developing cycle has been completed, the triangular opening will be positioned somewhat to the left from that shown in Fig. 2. When the developing cycle has been completed, the cam 37 will have been rotated far enough to bring the raised portion 76 of the cam 37 into engagement with the portion '74 of the right toggle pin '71 to rock the right toggle clockwise about its pivot 67 to open switch 57 and disconnect the motor from shaft 31 to complete the developing cycle. As the shaft 31 is now free, the coil return spring 4-2 will rock the parts clockwise back to the 15second setting, Fig. 9, to position the parts to start another exposure cycle. This clockwise rotation of the parts will cause the arm 99 to be wedged between wall 109 and washer 101 to rock the arm 98 clockwise about edge 102 to cause arm 98 to lie against base 96 of the opening 95. In this position, edge 112 is out of the path of the stop 111 and will not be engaged thereby so that the parts will return to their initial 15 second setting and with the earns 36 and 37 at the position illustrated in Fig. 9, and with the arm 43"against stud at 44' ready to start another exposure cycle. Thus, after the completion of the developing cycle, the parts are again positioned automatically and ready for the next exposure cycle.

Thus, with the above-described device, a plurality of successive exposure cycles can be performed; and, at the end of each exposure cycle, the parts are returned automatically to position to start the next exposure cycle. On the other hand, each exposure cycle may be followed by a developing cycle; and, after the completion of the latter cycle, the parts are returned automatically to the initial or starting position and inreadiness to-make the next exposure cycle. Furthermore, the cams 36 and 37 are used not only to trip the switches at the completion of the cycles, but are also used as blocking members which allow only one toggle member at a time to be rocked so as to control the specific switch which is closed to insure that only one cycle is in operation at one time, and that the cycles are in proper sequence and of the predetermined time interval.

While one embodiment of the invention has been disclosed, the inventive idea may be carried out in a number of ways. This application is, therefore, not to be limited to the precise details described but is intended to cover all variations and modifications falling within the scope of the appended claims.

What I claim and desire to secure by Letters Patent of tne United States is:

circuit including a switch for controlling said motor, an

auxiliary-circuit control switch, means including a toggle member for closing said switches simultaneously, means to move said toggle in one direction to close said switches, and control means carried by said shaft and operable at the end of said interval to engage said toggle and to move the latter in the opposite direction to open said switches.

2. A timer comprising, in combination, a scale, a presettable member movable relative to said scale to indicate a predetermined time interval, a timer shaft, spring means to rock said shaft automatically from a Zero position to a timing position when said member is set to position said shaft in a timing relation and in accordance with the setting of said member, an electric motor and a circuit therefor including a switch for controlling said motor,

, means to connect said motor to said shaft to rotatethe latter at a uniform speed, an auxiliary-circuit control switch, a rockable toggle member, means yieldably connecting said toggle member to said switches so that movement of said toggle member in opposite directions will close and open said switches simultaneously, means to rock said toggle member in one direction to close said switches to energize the circuits and to rotate said shaft from said timing position to said zero position, and means for rocking said toggle member in the opposite direction when said shaft reaches said zero position and at the end of said interval to open said switches.

3. A timer comprising, in combination, a scale, a presettable member movable relative to said scale to indicate a predetermined time interval, a timer shaft, means to rock said shaft upon setting said member to position said shaft in timing relation in accordance with the setting of said member, an electric motor releasably connected to said shaft to rotate the latter at a uniform rate, a motor circuit including a switch for controlling the operation of said motor, an auxiliary-circuit control switch, a rockable toggle member, means to connect said toggle yieldably to said switches to close both switches simultaneously when said toggle is moved in one direction, a manual means connected to said toggle to move the latter in said one direction, a control cam carried on and rotatable as a unit with said shaft, a blocking section on said cam posltionable in the path of said toggle member to prevent the movement of said toggle member in said one direction, said blocking section being movable out of blocking relation with said toggle member when said shaft is moved to timing relation to free said toggle member, and means on said cam engaging said toggle at the end of said interval to move said toggle member in the opposite direction to open said switches and to permit said first means again to rock said shaft to timing relation.

4. A timer comprising, in combination, a scale, a presettable member movable relative to said scale to indicate a predetermined time interval, a timer shaft, means to rock said shaft upon setting said member to position said shaft in timing relation in accordance with the setting of said member, an electric motor releasably connected to said shaft to rotate the latter at a uniform rate, a motor circuit including a switch for controlling the operation of said motor, an auxiliary-circuit control switch,

a rockable toggle member, means to connect said toggle yieldably to said switches to close both switches simultaneously when said toggle is moved in one direction, manually operated toggle actuating means, resilient connecting means between said actuating means and said toggle, and control means operated by said motorv and operative at the end of said interval to move said toggle member in the opposite direction to open said switches.

5. A timer comprising, in combination, a scale, a presettable member movable relative to said scale to indicate a predetermined time interval, a timing shaft, means to move said shaft automatically from a zero position to a timing position upon the setting of said member and in accordance with the setting thereof, an electric motor releasably connected to said shaft to rotate the latter at a constant speed, a circuit for said motor including a switch for controlling said motor, an auxiliary-circuit control switch, a rockable toggle member, a yieldable connection between said switches and said toggle member so that rocking of the latter in one direction will close both switches simultaneously, a cam carried by and rotatable as a unit with said shaft, a blocking section on said cam positionable in the path of said toggle when said shaft is in said zero position to prevent the rocking of said toggle member in said one direction, the movement of said shaft from said Zero to said timing position serving to move said blocking section out of blocking relation with said toggle member to free the latter, a toggle actuating member to move said toggle in said one direction, a yieldable connection between said actuating member and said toggle member, and an operating section on said cam engaging said toggle at the end of said interval to move said toggle in the opposite direction to open said switches, said shaft returning to said zero position at the end of said cycle and being disconnected from said motor to free said shaft said first means then rocking said freed shaft to return the latter to said timing position.

6. A timer for timing a plurality of operations of predetermined time intervals and in a definite timed sequence comprising, in combination, a pair of circuit control switches, means tending to close both of said switches simultaneously, blocking means positioned to permit the closing of only one of said switches upon the operation of said closing means, and means to open the closed switch at the end of a predetermined time interval and simultaneously block the previously closed switch against a second closing while at the same time removing the blocking means from the second switch so that upon again operating said closingmeans the previously blocked switch can be closed.

v 10 l v A timer for timing a plurality of operations of predetermined time intervals and in a definite timed sequence comprising, in combination, a pair of circuit control switches, means tending to close both of said switches simultaneously, a blocking member for each switch positionable to prevent the closing of the associated switch, means to position only one of said blocking members in position to prevent the closing of one of said switches upon the operation of said closing means, the other of said switches being closed when saidclosing means is actuated, means to open the closed switch after a predetermined timed interval and simultaneously position the associated blocking member in operative relation with the opened switch to prevent a second closing thereof, means to move the blocking member out of blocking relation with the previously blocked switch so that the latter can be closed upon a second actuation of said closing means, and means to open the second switch at the end of a predetermined timed interval.

8. A timer for timing a pair of operations of predetermined time intervals and in a definite timed sequence, comprising, in combination, a pair of circuit control switches, a rockable toggle member connected to each switch and tending to snap the switches to open and closed position upon rocking the toggle member in opposite directions, a single operating member, means connecting said operating member to said toggle member so that the actuation of said operating member tends to rock both toggle members to close both switches, means positionable in the path of one of said toggle members to prevent the operation thereof so that only one switch is closed when the operating member is actuated, means for opening the closed switch aftera predetermined timed interval and for simultaneously moving the blocking member of the opened switch into thepath of the associated toggle member to block said open switch against a second closing, means for simultaneously moving the blocking member associated with the second toggle member out of blocking relation therewith so that a second actuation of said operating member will close only the other switch, and means for opening the second switch at the end of a predeterminedtime interval.

9. A timer comprising, in combination, a scale, a presettable member movable relative to said scale to indicate a predetermined time interval, a driven timer shaft, a pair of control cams mounted in axially spaced relation on said shaft, a pair of circuit control switches, a rockable toggle member positioned in radial alignment with each of said cams, means to connect each toggle member separately with one of said switches so that when each toggle is rocked in one direction the switch connected thereto is closed, means tending to rock both toggle members'in said one direction, blocking means positionable selectively in the path of said toggle members to permit the rocking of only one toggle at a time so that only one switch at a time may be closed, and means on said cams engaging the specific toggle member which has been moved to rock the last-mentioned toggle member in the opposite direction to open the switch associated therewith.

10. A timer comprising, in combination, a scale, a presettable member movable relative to said scale to indicate a predetermined time interval, a driven timer shaft, a pair of control cams mounted in axially spaced relation on said shaft, a pair of circuit control switches, a rockable toggle member positioned in radial alignment with each of saidcams, means to connect each toggle member separately with one of said switches so that when each toggle is rocked in one direction the switch connected thereto is closed, means tending to rock both toggle members in said one direction, a blocking section on each of said cams positionable in the, path of the associated toggle member, said sections being atblocking section out of blocking relation with its toggle member to permit the rocking thereof in said one directon to close one switch, the blocking section of the other cam is in blocking relation with the associated toggle member so that only one toggle member at a time can be rocked in said one direction to close its associated switch, and an operative section on each cam adapted at the end of the time interval to engage the toggle member which has been rocked in said one direction to move said last-mentioned toggle member in the opposite direction to open the previously closed switch.

11. A timer comprising, in combination, a scale, a presettable member movable relative to said scale to indicate a predetermined time interval, a timer shaft, means to rotate said shaft at a constant speed, means to rock said shaft automatically from a zero position to a timing position when said member is moved, a first cam on said shaft, a second cam on said shaft, a rockable toggle member in radial alignment with each cam, apair of circuit control switches, means to connect said switches separately to said toggle members so that the rocking of each toggle member in one direction will close the switch connected thereto, means tending to rock both-toggle members simultaneously in said one direction, a blocking section on said second cam positionable in the path of the toggle member in' alignment therewith when said shaft is in said timing position to prevent the rocking of said last-mentioned toggle member, a blocking section on said first cam which is'movable out of the path of the alignedtoggle member when said shaft is in said, timing position so as to permit the last-mentioned toggle member to be rocked in said one direction to close the switch connected thereto, and a control section on said first cam engaging the rocked toggle member to rock the latter in the opposite direc tion at the end of said interval to open the switch connected thereto. V 12. A timer comprising, in combination, a scale, a presettable member movable relative to said scale to indicate a predetermined time interval, a timer shaft, means to rotate said shaft at a constant speed, means to rock said shaft automatically from a zero position to a timing position when said member is moved, a first cam on said shaft, a second cam on said shaft, a rockable toggle member in radial alignment with each cam, a pair of circuit control switches, means to connect said switches separately to said toggle members so that the rocking of each toggle member in one direction will close the switch connected thereto, means tending to rock both toggle members simultaneously in said one direction, a blocking section on said second cam positionable in the path of the toggle member 'in alignment therewith when said shaft is in said timing position to prevent the rocking of said last-mentioned toggle member, a blocking section on said first cam which is movable out of the path of the aligned toggle member when said shaft is in said timing position so as to permit the last-mentioned toggle member to be rocked in said one direction to close the switch connected thereto, said shaft rotating from said timing position to said zero position, a control section on said first cam engaging said rocked toggle member when said shaft reaches said zero position to rock said last-mentioned toggle member in the opposite direction to open the switch connected thereto, means to hold said shaft in said zero position in which the blocking section of the first cam is in blocking relation with the associated toggle member to prevent a second operation of the latter but with the blocking section of the second cam out of blocking relation with the toggle member aligned with the second cam, whereby a second actuation of the toggle rocking means will rock only the toggle member-"aligned with the second cam to close the switch connected thereto, and an operating section on the second cam engaging the last rocked toggle member to move connected thereto. 7

13. A timer comprising, in combination, a scale, a presettable member movable relative to said scale to indicate a predetermined time interval, a timer shaft, means to rock said shaft from a zero position to a timing position in accordance to and in relation with the movement of said member, an electrical motor releasably connected to said shaft to rotate the latter at a constant-speed, a motor circuit including a first motor switch for controlling the operation of said motor, an auxiliary-circuit control switch, a rockable toggle member, means to connect said toggle member to both of said switches to close said switches when said toggle member is moved in one direction, a second motor switch in the circuit of said motor for closing the motor circuit independently of said first motor switch, a second rockable toggle member, means to connect said second toggle member to said second motor switch so that rocking of said second toggle member in said one direction will close said second motor switch, means tending to rock both toggle members simultaneously in said one direction, a control cam on said shaft in radial alignment with the first toggle member, a second control cam on said shaft in radial alignment with the second toggle member, a blocking section on each cam adapted to prevent movement of said toggle members in said one direction, the movement of the shaft from the zero position to the timing position serving to move the blocking section of the first cam out of blocking relation with the first toggle member to free the latter but simultaneously moving the blocking section of the second cam into blocking relation with the second toggle member so that actuation of the toggle member rocking means will rock only the first toggle member in said one direction to close said auxiliary-circuit control switch and-also close'the first motor switch to energize the motor to turn the shaft at a constant speed from said timing position to said zero position to provide a first timing cycle, an operation section in the first cam movable into engagement with said first toggle member when said shaft reaches said zero position and at the end of the interval to rock said first toggle member in the opposite direction to open said auxiliary-circuit control switch and said first motor switch to terminate said first timing cycle, means to retain said shaft in said zero position cam out of blocking relation with the second toggle member so that a second actuation of said toggle rocking means will rock only the second toggle member to close the second motor switch to energize the motor to move the shaft a further distance to control a second timing cycle, and an operating section on said second cam engaging said second toggle member at the end of said second timing cycle to move said second toggle member in the opposite direction to open said second motor switch to stop said shaft.

14. A timer comprising, in combination, a scale, a presettable member movable relative to said scale to indicate a predetermined time interval, a timer shaft, means to rock said shaft from a Zero position to a timing position in accordance to and in relation with the movement of said member, an electrical motor releasably connected to said shaft to rotate the latter at a constant speed, a motor circuit including a first motor switch for 13 second motor switch so that rocking of said second toggle member in said one direction will close said second motor switch, means tending to rock both toggle members simultaneously in said one direction, a control cam on said shaft in radial alignment with the first toggle member, a second control cam on said shaft in radial alignment with the second toggle member, a blocking section on each cam adapted to prevent movement of said toggle members in said one direction, the movement of the shaft from the zero position to the timing position serving to move the blocking section of the first cam out of blocking relation with the first toggle member to free timing position to said zero position to provide a first timing cycle, an operation section in the first cam moving into engagement with said first toggle member when said shaft reaches said zero position and at the end of the interval to rock said first toggle member in the opposite direction to open said auxiliary-circuit control switch and said first motor switch to complete said first timing cycle, means to retain said shaft in said zero position with the blocking section of said first cam in blocking relation with said first toggle member to prevent operation thereof and with the blocking section on the second cam out of blocking relation with the second toggle member so that a second actuation of said toggle rocking means will rock only the second toggle member to close the second motor switch to energize the motor to move the shaft a further distance to control a second operating cycle, an operating section on said second cam engaging said second toggle member at the end of said second timing cycle to move said second toggle member in the opposite direction to open said second motor switch to stop said shaft, and means operative at the end of said second timing cycle to render the shaft zero retaining means inoperative to enable the first-mentioned means to rock the shaft back to the timing position.

15. A timer comprising, in combination, a scale, a presettable member movable relative to said scale to indicate a predetermined time interval, a timer shaft, means to rock said shaft from a zero position to a timing position in accordance to and in relation with the movement of said member, an electrical motor releasably connected to said shaft to rotate the latter at a constant speed, a motor circuit including a first motorswitch for controlling the operation of said motor, an auxiliary-circuit control switch, a rockable toggle member, means to connect saidtoggle member to both of said switch to close said switches when said toggle member is moved in one direction, a second motor switch in the circuit of said motor for closing the motor circuit independently of said first motor switch, a second rockable toggle member, means to connect said second toggle member to said second motor switch so that rocking of said second toggle member in said one direction will close said second motor switch, means tending to 'rock both toggle members simultaneously in said one direction, separate yieldable connections between said toggle member rocking means and the individual toggle members, a control cam on said shaft in radial alignment with the first toggle member, a second control cam on said shaft in radial alignment with the second member, a blocking section on each cam adapted to prevent movement of said toggle members in said one direction, the movement of the shaft from the zero position to the timing position serving to move the blocking section of the first cam out of blocking relation with the first toggle member to free the latter but simultaneously moving the blocking section of the second cam into blocking relation with the second toggle member so that actuation of the toggle member rocking means will rock only, the first toggle member in said one direction to close said auxiliary-circuit control switch and also close the first motor switch to energize the motor to turn the shaft at a constant speed from said timing positionto said zero position to provide a first timing cycle, an operation section in the first cam movable into engagement with said first toggle member when said shaft reaches said zero position and at the end of the interval to rock saidfirst toggle member in the opposite direction to open said auxiliary-circuit control switch and said first motor switch to complete said first timing cycle, means to retain said shaft in said zero position with the blocking section of said first cam in blocking relation with said first toggle member to prevent operation thereof and with the blocking section on the second cam out of blocking relation with the second toggle member so that a second actuation of said toggle rocking means will rock only the second toggle member to close the second motor switch to energize the motor to move the shaft a further distance to control a second timing cycle, and an operating section on said second cam engaging said second toggle member at the end of said second timing cycle to move said second toggle member in the opposite direction to open said second motor switch to stop said shaft.

16. A timer comprising, in combination, a scale, a presettable member movable relative to said scale to indicate a predetermined time interval, a timer shaft, means to rock said shaft from a zero position to a timing position in accordance to and in relation with the movement of said member, an electrical motor releasably connected to said shaft to rotate the latter at a constant speed, a motor circuit including a first motor switch for controlling the operation of said motor, an auxiliarycircuit control switch, a rockable toggle member, means to connect said toggle member to both of said switches to close saidswitches when said toggle member is moved in one direction, a second motor switch in the circuit of said motor for closing the motor circuit independently of said first motor switch, a second rockable toggle member, means to connect said second toggle member to said second motor switch so that rocking of said second toggle member in said one direction will close said second motor switch, means tending to rock both toggle members simultaneously in said one direction, separate yieldable connections between said toggle member rocking means and the individual toggle members, a control cam on said shaft in radial alignment with the first toggle member, a second control cam on said shaft in radial alignment with the second toggle member, a blocking section on each cam adapted to prevent movement of said toggle members in said one direction, the movement of the shaft from the zero position to the timing position serving to move the blocking section of the first cam out of blocking relation with the first toggle member to free the latter but simultaneously moving the blocking section of the second cam into blocking relation with the second toggle member so that actuation of the toggle member rocking means will rock only the first toggle member in said one direction to close said auxiliary-circuit control switch and also close the first motor switch to energize the motor to turn the shaft at a constant speed from saidtiming position to said zero position to provide a first timing cycle, an operation section on the first cam movable into engagement with said first toggle member when said shaft reaches said zero position and at the end of the interval to rock said first toggle member in the opposite direction to open said auxiliary-circuit control switch and said first motor switch to complete said first timing cycle, means to retain said shaft in said zero position with the blocking section of said first cam in blocking relation with said first toggle member to prevent operation thereof and with the blocking section on the second cam out of blocking relation with the second toggle member so that a second actuation of said toggle rocking means will rock only the second toggle member to close the second motor switch to energize the motor to move the shaft a further distance to control a second timing cycle, an operating section on said second cam engaging said second toggle member at the end of the second timing cycle to move said second toggle member in the opposite direction to open said second motor switch to stop said shaft, and means operative at the end of said second timing cycle to render the shaft Zero retaining means inoperative to enable the first-mentioned means to rock the shaft back to the timing position.

17. A timer comprising, in combination, a scale, a presettable member movable relative to said scale to indicate a predetermined time interval, a timer shaft, means to rock said shaft from a zero position to a timing position in accordance to and in relation with the movement of said member, an electrical motor releasably connected to said shaft to rotate the latter at a constant speed, a motor circuit including a first motor switch for controlling the operation of said motor, an auxiliary-circuit control switch, a rockable toggle member, means to connect said toggle member to both of said switches to close said switches when said toggle member is moved in one direction, a second motor switch in the circuit of said motor for closing the motor circuit independently of said first motor switch, a second rockable toggle member, means to connect said second toggle member to said second motor switch so that rocking of said second toggle member in said one direction will close said second motor switch, the connection between-each toggle member and its associated switch including a yieldable member which will be tensioned as each toggle member is moved in said one direction and when the toggle member passes its dead center position will quickly snap the switch, means tending to rock both toggle members simultaneously in said one direction, a control cam on said shaft in radial align ment with the first toggle member, a second control cam on said shaft in radial alignment with the second toggle member, a blocking section on each cam adapted to prevent movement of said toggle members in said one direction, the movement of the shaft from the zero position to the timing position serving to move the blocking section of the first cam out of blocking relation with the first toggle member to free the latter but simultaneously moving the blocking section of the second cam into blocking relation with the second toggle member so' that actuation of the toggle member rocking means will rock only the first toggle member in said one direction to close the auxiliary-circuit control switch and also close the first motor switch to energize the motor to turn the shaft at a constant speed from said timing position to said Zero position to provide afirst timing cycle, an operation section on the cam movable into engagement with said first toggle member when said shaft reaches said Zero position and at the end of the interval to rock said first toggle member in the opposite direction to open said auxiliary-circuit control switch and said first motor switch to complete said first timing cycle, means to retrain said shaft in said zero position with the blocking section of said first cam in blocking relation with said first toggle member to prevent operation thereof and with the blocking section on the second cam out of blocking relation with the second toggle member so that a second actuation of said toggle rocking means will rock only the second toggle member to close the second motor switch to energize the motor to move the shaft a further distance to control a second timing cycle, and an operating section on said second cam engaging said second toggle member at the end of said second timing cycle to move said second toggle member in the opposite direction to open said second motor switch to stop said shaft.

18. A timer comprising, in combination, a scale, a presettable member movable relative to said scale to indicate a predetermined time interval, a timer shaft, means to rock said shaft from a zero position to a timing position in accordance to and in relation with the movement of said member, an electrical motor releasably connected to said shaft to rotate the latter at a constant speed, a motor circuit including a first motor switch for con trolling the operation of said motor, an auxiliary-circuit control switch, a rockable toggle member, means to connect said toggle member to both of said switches to close said switches when said toggle member is moved in one direction, a second motor switch in the circuit of said motor for closing the motor circuit independently of said first motor switch, a second rockable toggle member, means to connect said second toggle member to said second motor switch so that rocking of said second toggle member in said one direction will close said second motor switch, the connection between each toggle memoer and its associated switch including a yieldable member which will be tensioned as each toggle member is moved in said one direction and when the toggle member passes its dead center position will quickly snap the switch, means tending to rock both toggle members simultae neously in said one direction, a control cam on said shaft in radial alignment with the first toggle member, a second control cam on said shaft in radial alignment with the second toggle member, a blocking section on each cam adapted to prevent movement of said toggle members in said one direction, the movement of the shaft from the Zero position to the timing position serving to move the blocking section of the first cam out of blocking relation with the first toggle member to free the latter but simultaneously moving the blocking section of the second cam into blocking relation with the second toggle mom oer so that actuation of the toggle member rocking means will rock only the first toggle member in said one direc tion to close the auxiliary-circuit control switch and also close the first motor switch to energize the motor to turn the shaft at a constant speed from said timing position to said Zero position to provide a first timing cycle, an operation section on the cam movable'into engagement with said first toggle member when said shaft reaches said zero position and at the end of the interval to rock said first toggle member in the opposite direction to open said auxiliary-circuit control switch and said first motor switch to complete the exposure cycle, means to retain said shaft in said zero position with the block-" ing section of said first cam in blocking relation with said first toggle member to prevent operation thereof and with the blocking section of the second cam out of block ing relation with the second toggle member so that a' second actuation of said toggle rocking means will rock only the second toggle member to close the second motor switch to energize the motor to move the shaft a further distance to control a second timing cycle, and an operating section on said second cam engaging said second toggle member at the end of said second timing cycle to move said second toggle member in the opposite direc' tion to open said second motor switch to stop said shaft.

References Cited in the file of this patent UNITED STATES PATENTS d w *s

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